It sounds as though you guys are referring to something which is called a forbidden list. It has everything to do with preventing UE from continually trying to attach to a foreign PLMN. There is no relevance to link conditions and only specific attach reject messages. The UE will store a forbidden PLMNID list until it is rebooted. Without this a UE could continually attempt to attach to a network for which is has no HSS instance
Here are a few quotes from the standard "To avoid unnecessary registration attempts, lists of forbidden PLMNs" "If a PLMN is selected but the UE cannot register on it because registration is rejected with the cause "PLMN not allowed", the UE shall add the PLMN to the "Forbidden PLMN" list. " "If a PLMN is selected but the UE cannot register for PS services on it because registration is rejected with the cause "GPRS services not allowed in this PLMN", the UE shall not re-attempt to register for E-UTRAN or UTRAN PS or GERAN PS on that network. The PLMN is added to the list "Forbidden PLMN's for GPRS services". The UE shall not re-attempt to register " Regards Nick -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: October 4, 2016 10:44 PM To: [email protected] Subject: Telrad Digest, Vol 24, Issue 5 Send Telrad mailing list submissions to [email protected] To subscribe or unsubscribe via the World Wide Web, visit http://lists.wispa.org/mailman/listinfo/telrad or, via email, send a message with subject or body 'help' to [email protected] You can reach the person managing the list at [email protected] When replying, please edit your Subject line so it is more specific than "Re: Contents of Telrad digest..." Today's Topics: 1. Re: CPE reconnect (Matt Hoppes) 2. Re: CPE reconnect (Adam Moffett) ---------------------------------------------------------------------- Message: 1 Date: Tue, 4 Oct 2016 21:39:29 -0400 From: Matt Hoppes <[email protected]> Subject: Re: [Telrad] CPE reconnect To: [email protected] Message-ID: <[email protected]> Content-Type: text/plain; charset="utf-8" Why do I have such a love hate relationship with LTE. So how does this work in the macro network? Cell phone black lists site, then drives closer to it. Shouldn't it associate without having to be rebooted? > On Oct 4, 2016, at 21:36, Matthew Carpenter <[email protected]> > wrote: > > If the UE tries to connect to the eNB and is unable to AUTH the SIM card then > it will blacklist after 3 or 4 attempts. > At that point the UE must be rebooted to connect. I have seen this happen > many times back last January. > No way around it, its a LTE thing.. > > On the UE?s dropping from 50-60Mbit to 2Mbit, what I have seen is its an > upload issue. The Upload QAM is SO low that it cannot perform well on the > download. > A reboot brings it around and the speeds go back to normal. > What I have been told is the UE/eNB will lower the QAM rate due to > interference or other issues and it will lower the QAM faster then its rises > it back up. > > What are the ?other issues? you ask? On the CPE7000 it was bad boards that > would cause high bit rate errors inside the radio causing it to think it has > interference. > Replacing the UE would fix it. I also think the old crappy POE injectors > causes issues as well.. cannot prove it.. > > I have a UE that did this yesterday, I will watch it and if it > continues to lower is QAM over the period of a day or so then we will > replace the UE. (CPE7000) > > Also watching the tlsyslog on the EPC will give you all sorts of good > information as to what a UE is doing, or not doing correctly. I highly > suggest you watch it for bad UE?s. > > > MattCarpenter > > > > > >> On Oct 4, 2016, at 4:31 PM, Jeremy Austin <[email protected]> wrote: >> >> >>> On Tue, Oct 4, 2016 at 1:22 PM, Matt Hoppes >>> <[email protected]> wrote: >>> >>> If so, is there a way around this so a customer does not have to reboot the >>> CPE? >> >> When an IMSI is blacklisted, does this mean it isn't available for a detach? >> >> I haven't seen this problem yet, as far as I know. >> >> I'm still trying to explain why a UE should jump from 50-60 megs down, to 2, >> on a lightly loaded sector. I've been testing the 8000 on a 2x4 sector >> today. This is somewhat similar behavior to what we get daily complaints >> about ? it appears to affect customers somewhat randomly, and there is no >> cure but to wait. (I'm not about to reset the EPC.) I had hoped I wouldn't >> see it on the 8000, but so far I may be. >> >> Other than that, RF performance on the 8000 is good. I'm consistently >> hitting high modulations and 6-7 Mbps on the upstream. >> >> >> -- >> Jeremy Austin >> >> (907) 895-2311 >> (907) 803-5422 >> [email protected] >> >> Heritage NetWorks >> Whitestone Power & Communications >> Vertical Broadband, LLC >> >> Schedule a meeting: http://doodle.com/jermudgeon >> _______________________________________________ >> Telrad mailing list >> [email protected] >> http://lists.wispa.org/mailman/listinfo/telrad > > _______________________________________________ > Telrad mailing list > [email protected] > http://lists.wispa.org/mailman/listinfo/telrad -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.wispa.org/mailman/private/telrad/attachments/20161004/04e4ebcc/attachment-0001.html ------------------------------ Message: 2 Date: Tue, 4 Oct 2016 21:43:53 -0400 From: Adam Moffett <[email protected]> Subject: Re: [Telrad] CPE reconnect To: [email protected] Message-ID: <[email protected]> Content-Type: text/plain; charset="windows-1252" If it's specifically an AUTH issue as opposed to a weak signal issue then it seems like that ought to work. The phone could have enough brains in it's algorithm to note that there was an auth failure and also weak CINR so maybe don't blacklist that eNB until we try it again when CINR improves. It was described to me as a function of the CPE, and if that's the case then the solution would have to be implemented in the CPE. > Why do I have such a love hate relationship with LTE. > > So how does this work in the macro network? Cell phone black lists > site, then drives closer to it. Shouldn't it associate without having > to be rebooted? > > On Oct 4, 2016, at 21:36, Matthew Carpenter > <[email protected] > <mailto:[email protected]>> wrote: > >> If the UE tries to connect to the eNB and is unable to AUTH the SIM >> card then it will blacklist after 3 or 4 attempts. >> At that point the UE must be rebooted to connect. I have seen this >> happen many times back last January. >> No way around it, its a LTE thing.. >> >> On the UE?s dropping from 50-60Mbit to 2Mbit, what I have seen is its >> an upload issue. The Upload QAM is SO low that it cannot perform >> well on the download. >> A reboot brings it around and the speeds go back to normal. >> What I have been told is the UE/eNB will lower the QAM rate due to >> interference or other issues and it will lower the QAM faster then >> its rises it back up. >> >> What are the ?other issues? you ask? On the CPE7000 it was bad >> boards that would cause high bit rate errors inside the radio causing >> it to think it has interference. >> Replacing the UE would fix it. I also think the old crappy POE >> injectors causes issues as well.. cannot prove it.. >> >> I have a UE that did this yesterday, I will watch it and if it >> continues to lower is QAM over the period of a day or so then we will >> replace the UE. (CPE7000) >> >> Also watching the tlsyslog on the EPC will give you all sorts of good >> information as to what a UE is doing, or not doing correctly. I >> highly suggest you watch it for bad UE?s. >> >> >> MattCarpenter >> >> >> >> >> >>> On Oct 4, 2016, at 4:31 PM, Jeremy Austin <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> >>> On Tue, Oct 4, 2016 at 1:22 PM, Matt Hoppes >>> <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> >>> If so, is there a way around this so a customer does not have to >>> reboot the CPE? >>> >>> >>> When an IMSI is blacklisted, does this mean it isn't available for a >>> detach? >>> >>> I haven't seen this problem yet, as far as I know. >>> >>> I'm still trying to explain why a UE should jump from 50-60 megs >>> down, to 2, on a lightly loaded sector. I've been testing the 8000 >>> on a 2x4 sector today. This is somewhat similar behavior to what we >>> get daily complaints about ? it appears to affect customers somewhat >>> randomly, and there is no cure but to wait. (I'm not about to reset >>> the EPC.) I had hoped I wouldn't see it on the 8000, but so far I >>> may be. >>> >>> Other than that, RF performance on the 8000 is good. I'm >>> consistently hitting high modulations and 6-7 Mbps on the upstream. >>> >>> >>> -- >>> Jeremy Austin >>> >>> (907) 895-2311 >>> (907) 803-5422 >>> [email protected] <mailto:[email protected]> >>> >>> Heritage NetWorks >>> Whitestone Power & Communications >>> Vertical Broadband, LLC >>> >>> Schedule a meeting: http://doodle.com/jermudgeon >>> _______________________________________________ >>> Telrad mailing list >>> [email protected] <mailto:[email protected]> >>> http://lists.wispa.org/mailman/listinfo/telrad >> >> _______________________________________________ >> Telrad mailing list >> [email protected] <mailto:[email protected]> >> http://lists.wispa.org/mailman/listinfo/telrad > > > _______________________________________________ > Telrad mailing list > [email protected] > http://lists.wispa.org/mailman/listinfo/telrad -------------- next part -------------- An HTML attachment was scrubbed... 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